Am I reading the t and z-tables correctly?

[Eagerissac]

So I'm trying to find the values for the question in the pic below. I'm wondering if someone could double check my answers? I'm a little confused about 2 of them.

My answers I got from reading the tables are:

i) 2.056
ii) 0
iii) -2.056
iv) -2.07
v) ?
vi) 2.07

I think I have most of the answers correct but I'm not sure about ii) and v). For i) I couldn't find the column 0.975 anywhere in the table so I just assumed the answer would be 0? And then for iii) and v) I have no idea what to do with the negative sign in front of the z.

I also noticed there are one and two-tailed options for when looking up values in the t-table and was wondering how do you know which one to choose? It doesn't seem to specify it in the question.

 

[Dr.Peterson]

Check your book's definition of the notation they are using, and their explanation of using the table; somewhere they should tell you that the notation relates to the one-sided case.

A negative sign before anything means the same thing -- just negate the value.

For (ii), think about symmetry. I would expect there to be an example similar to it.